plzzz help me out with these questions....
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hey i know 20 question only.
(a+b+c)(a2+b2+c2-ab-bc-ca)
(a+b+c)(a2+b2+c2-(ab+bc+ca)
a2+b2+c2=83
(a+b+c)2=a2+b2+c2+2(ab+bc+ca)
(15)2=83+2(ab+bc+ca)
225-83=2(ab+bc+ca)
142/2=(ab+bc+ca)
71=(ab+bc+ca)
(a+b+c)(a2+b2+c2-ab-bc-ca)
(a+b+c)(a2+b2+c2-(ab+bc+ca)
a2+b2+c2=83
(a+b+c)2=a2+b2+c2+2(ab+bc+ca)
(15)2=83+2(ab+bc+ca)
225-83=2(ab+bc+ca)
142/2=(ab+bc+ca)
71=(ab+bc+ca)
ritik767:
don't know about this is right answer
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